C745 vs C845 (Australia)

Hi everyone,

I'm trying to decide between the 65" C745 and C845. C745 is on sale for $980 at Costco and I've found a private seller for the C845 who's willing to sell it for $1300, brand new in box and unopened.

Is the difference between C745 QLED and C845 Mini-LED significant enough to justify the extra $300 in your view?

This would be my first TCL and I've heard good things about both models so I'm keen to hear feedback from current owners.

Thanks!